The interrogation

Why didn't tairn just go for another dragon after he got back after >!hunting Solas!< , like why didn't he just go for one of varrishes henchmen's dragon, or just use his giant 75 ft body and giant morningstar tail to smash the school, because if i remember correctly he said something like he would do anything for violet, so like why wait for >!xaden to come kill everyone and then save her !<when he ass the second largest dragon on the continent just to something like treathen a dragon or destroy the school

idk just a thought i had